JPH0324705U - - Google Patents
Info
- Publication number
- JPH0324705U JPH0324705U JP8552989U JP8552989U JPH0324705U JP H0324705 U JPH0324705 U JP H0324705U JP 8552989 U JP8552989 U JP 8552989U JP 8552989 U JP8552989 U JP 8552989U JP H0324705 U JPH0324705 U JP H0324705U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- oscillation
- input
- signal
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000010355 oscillation Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
第１図乃至第３図は本考案に係るＦＭ復調回路
の一実施例を説明するためのもので、第１図は発
振回路を示す回路図、第２図はＦＭ復調回路の具
体的構成を示す回路図、第３図は第２ＩＦ信号の
入力周波数に対する出力電圧の関係を示す特性図
である。第４図は衛星放送受信システムの構成を
示すブロツク図、第５図は第４図のＦＭデモジユ
レータでのＦＭ復調回路を示す回路構成ブロツク
図である。第６図は従来のＦＭ復調回路の発振回
路を示す回路図、第７図は第２ＩＦ信号の入力周
波数に対する出力電圧の関係を示す特性図である
。
５……ＰＬＬ検波回路、８……発振回路、１２
，１３……可変容量ダイオード、１４……反転回
路、Ｓ２……入力信号、Ｓ３……ベースバンド信
号、Ｓｃ……制御信号。
1 to 3 are for explaining an embodiment of the FM demodulation circuit according to the present invention. FIG. 1 is a circuit diagram showing an oscillation circuit, and FIG. 2 is a specific configuration of the FM demodulation circuit. The circuit diagram shown in FIG. 3 is a characteristic diagram showing the relationship between the output voltage and the input frequency of the second IF signal. FIG. 4 is a block diagram showing the configuration of a satellite broadcast receiving system, and FIG. 5 is a circuit configuration block diagram showing an FM demodulation circuit in the FM demodulator of FIG. 4. FIG. 6 is a circuit diagram showing an oscillation circuit of a conventional FM demodulation circuit, and FIG. 7 is a characteristic diagram showing the relationship between the output voltage and the input frequency of the second IF signal. 5...PLL detection circuit, 8...Oscillation circuit, 12
, 13...variable capacitance diode, 14...inverting circuit, S2 ...input signal, S3 ...baseband signal, Sc...control signal.
Claims (1)
検波してベースバンド信号を出力し、このベース
バンド信号を制御信号として発振回路に送出し、
この発振回路で入力周波数に応じた発振周波数を
生成して上記位相検波回路に送出するＦＭ復調回
路において、 上記発振回路での発振周波数の可変範囲を設定
する可変容量ダイオードのアノード側に、そのカ
ソード側に入力される制御信号を反転させてカソ
ード側とは逆相の電圧を印加する反転回路を設け
たことを特徴とするＦＭ復調回路。[Claims for Utility Model Registration] FM modulated input signal is phase detected by a phase detection circuit to output a baseband signal, and this baseband signal is sent as a control signal to an oscillation circuit,
In the FM demodulation circuit that generates an oscillation frequency according to the input frequency in this oscillation circuit and sends it to the phase detection circuit, the cathode is connected to the anode side of the variable capacitance diode that sets the variable range of the oscillation frequency in the oscillation circuit. An FM demodulation circuit comprising an inverting circuit that inverts a control signal input to the cathode side and applies a voltage having a phase opposite to that of the cathode side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8552989U JPH0324705U (en) | 1989-07-19 | 1989-07-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8552989U JPH0324705U (en) | 1989-07-19 | 1989-07-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0324705U true JPH0324705U (en) | 1991-03-14 |
Family
ID=31634718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8552989U Pending JPH0324705U (en) | 1989-07-19 | 1989-07-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0324705U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05179691A (en) * | 1991-12-27 | 1993-07-20 | Hokushiyou Cement Kogyosho:Kk | Side gutter block |
-
1989
- 1989-07-19 JP JP8552989U patent/JPH0324705U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05179691A (en) * | 1991-12-27 | 1993-07-20 | Hokushiyou Cement Kogyosho:Kk | Side gutter block |